Preventing browser tabs

Hi All,

Your assistance / help is needed and well valued.

My GWT application has a login page that being supported of course by
all browsers, from ie6 to chrome.

After login i want to prevent the user from opening another tab and
try to login again.

I mean to prevent it not by JS. Your help is needed, some things to
consider before answering :

1) When he opens a new tab in the same browser he is actually logged
in with the same session id.
counting on the same id is problematic, since i took in
consideration a situation in which user browser is
crashed, and he opens it again while it has the same session id, i
am logging him automatically again.

2) Using the cookie can be problematic also.

3) I need the solution to work on all browsers from ie6 to chrome.

Thanks in advance to you all,

Dor

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